For it is the duty of the good man to teach others the good that you could not work because of the malignity of the times or of fortune, so that when many are capable of it, someone of them more loved by heaven will be able to work it.

'In fact, Morgan's "structuralism," like that of his successors, was based on a positivist conception of science in which, to quote Alain Badiou:

The theory is the model, experimentation consists of isolating the empirical correlate which materializes the model; the experimental apparatus [must allow] for a separating effect exhibiting an approximate realization of the form.

(p.38)'

and

'Alain Badiou believes that Marx, on the contrary, believed that:

It is impossible to set a theoretical conception of history against real history defined by its very complexity - its empirical impurity. In Marxist epistemology the complexity is constructed according to the concepts of a theory. . . . It is the proper task of a theory of history to give an account of the nature of real society.

(p.39)

Obviously, Badiou in his more Althusserian moment, but I'll leave parsing/explanation to the real experts...